These MacBooks are built like tanks. I've had my 14" MacBook Pro for a year and it feels brand new. I can't imagine this laptop would pick up any damage in the next 3-4 years that would impact its ability to serve as a desktop at home. Plus, if the laptop is no longer serving well as a laptop, aren't you just going to replace it anyway, meaning that you've got a new desktop replacement anyway?
The performance of the M1 Pro is fantastic too. It performs better than a brand new 24" iMac, and it's way quieter as well even under full load.
With Apple silicon, I've found you get desktop performance without loud laptop cooling for the first time perhaps ever, thus begging the question as to why I need a desktop at all.
There are still reasons why it would be nice to have a desktop, such as running Plex, or the fact that it's just always there and you never have to bring over a separate device and plug it in. But for me, the only dealbreaker that keeps a desktop computer at my desk is the fact that Windows is still required for PC gaming.